It often seems that Jenelle Evans and Kailyn Lowry have been feuding forever, but the bad blood between these co-stars is actually a relatively new development.

They were never exactly besties, but it seems Kail only realized that Jenelle is bad news in early 2015 -- around the same time that many Teen Mom 2 viewers realized that Jenelle is a lost cause with no desire to reform.

Evans is no victim of circumstance.

She's not a troubled young woman trying to make her way in the world;...